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Let’s assume a boiler working at pressure 5Bar and producing steam of Two Tons per hour. Efficiency of this boiler is approx. 80%.
What would be cost of producing 2Tons of steam per hour on Natural Gas, Coal and Furnace Oil?
Our solution to this scenario is a simple formula which says:
Efficiency(n) = Output Quantityof Steam(Qs) X Energy in Steam(hf) Input Qt of Fuel (Qf) X Gross Cal. Val. (GCV) X Sp. Gravity of fuel Omitting Specific Gravity of fuels to simplify and Shifting variables of formula from here to there and vice versa. So, that Final shape becomes. Qf = Qs X hf GCV X n
So, Here what these are
Qf = Quantity of fuel needed to produce 2Tons steam per hour at 5 Bar
Qs = Qunatity of steam. This is fixed value 2000Kg per hour
Hf = Enthalpy of evaporation which is Fix Value taken from Steam table,2757KJ/Kg of Steam.(Means One Kilogram of steam has this much energy at Pressure 5 Bar)
GCV = Gross caloric value, Different for each combustible material.
N = Efficiency of Boiler, Fixed quantity taken as 80%, we will put 0.8 in formula.
Natural Gas: Natural gas is superb neat & clean, Eco Friendly and continuous source of energy. It has Gross Caloric Value of 43000KJ/m3, Specific Gravity of 0.7 and approx. cost of per metric cube of gas is 12 Rs. So, after placing these values into formula we will obtain answer of 229m3/Hr of gas required for above case and when this quantity is multiplied with per metric cube price of gas, final answer would be like 2600 Rs/Hr for producing 2Tons steam at 5Bar.
Coal: Coal has average Gross Caloric Value of 20000KJ/Kg and approx. cost of per Kg of coal is 8.5Rs. So, after placing these values into formula we will obtain answer of 325Kg/Hr of Coal required for above case and when this quantity is multiplied with per Kilogram cost of Coal, final answer would be like 2724Rs/Hr for producing 2Tons steam at 5Bar.
Furnace oil: Furnace oil has Gross Caloric Value of 41868KJ/Liter and has Specific gravity of approx. 0.96. cost of Furance oil per Liter is approx. 82 Rs. So, after placing these values into formula we will obtain answer of 161Liters/Hr of furnace oil required for above case and when this quantity is multiplied with per Literprice of Furnace oil, final answer would be like 13234Rs/Hr for producing 2Tons steam at 5Bar.
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